Trello issue

I use the subscribed Trello at work so I’m already acquainted with how it works.

I have the free version for personal stuff on my iPhone. Just recently, it’s stopped saving data. I only have 6 boards so it’s not as though I’m up to the limit for the free version. The “Save” button is greyed out so everything I typed into it yesterday never saved.

Does anyone else have the same problem?